Synthesis of Co-Rich CoAPO-5 Molecular Sieves: A Comparison between Glycerol and Water as Solvent
Abstract:CoAPO-5 molecular sieves have been synthesized with glycerol and water as solvent in order to maximize the degree of isomorphous substitution of Co2+ ions in the AFI framework. These CoAPO-5 molecular sieves have been characterized with X-ray diffraction, inductively coupled plasma-atomic emission spectroscopy, scanning electron microscopy, electron microprobe microanalysis, N2 sorption, and UV-visible-NIR-diffuse reflectance spectroscopy techniques. Optimum conditions for the synthesis of Co-rich single-phase and highly crystalline CoAPO-5 molecular sieves were obtained by varying the [Co]:[Al] ratio in the synthesis gel and the synthesis time. It will be shown that highly crystalline hexagonal single-phase CoAPO-5 crystals with a size between 3 and 10 m and a substitution degree of about 13% can be obtained from a 0.7CoO•0.65Al2O3•1P2O5•1(C2H5)3N•40HOCH2CHOHCH2OH gel at 190 C after 14 days of synthesis. This substitution degree is substantially higher than that for CoAPO-5 materials synthesized in the presence of water (i.e., about 7.5%).
Document Type: Research Article
Publication date: June 1, 2003
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